30 pointing in light of the excellent yields usually obtained for the pyridino diester ligand^.'^^^^ For example, compound 4b was prepared in an excellent yield of over 70%. 15 The dimethyl analogue of 19 was also prepared in a much diminished yield. 16 2, 6- Pyridinedicarbonyl chloride tends to decompose rapidly, and secondary glycols are less reactive so that more decomposition could take place before the acid chloride reads with ...
